TY JOUR TI METHODOLOGY FOR CALCULATING THE PARAMETERS OF A FIRE EXTINGUISHING SYSTEM USING HEAVY UNMANNED AIRCRAFT KW heavy unmanned aerial vehicles KW fire extinguishing KW hazardous industrial facilities KW calculation methodology KW hydraulic losses KW fire safety KW unmanned aircraft systems KW high-altitude technological installations JO Scientific and analytical journal «Vestnik Saint-Petersburg university of State fire service of EMERCOM of Russia» AU Sytdykov, M.R. AU Ostapova, M.V. AU Silnikov, N.M. PY 2026 IS 2025 PB Saint-Petersburg University of State Fire Service of Emercom of Russia